package exceptionhandling;

import java.io.*;               // For File class and FileNotFoundException
import java.util.*;             // For Scanner and InputMismatchException
import java.text.DecimalFormat; // For the DecimalFormat class
import javax.swing.JOptionPane; // For the JOptionPane class

/**
 * This program demonstrates how multiple exceptions can be caught with one try
 * statement.
 */
public class ExceptionHandling //SalesReport
{

    public static void main(String[] args)
    {
        // change this to a file path in your computer
        String filename = "/Users/Mayelin/Documents/Teaching/COP3804/Input_Output_Files/SalesData.txt"; // File name
        int months = 0;                    // Month counter
        double oneMonth;                   // One month's sales
        double totalSales = 0.0;           // Total sales
        double averageSales;               // Average sales

        // Create a DecimalFormat object.
        DecimalFormat dollar = new DecimalFormat("#,##0.00");
        
        try
        {
            // Open the file.
            File file = new File(filename);
            
            // The Scanner constructor may throw a FileNotFoundException
            Scanner inputFile = new Scanner(file);

            // Process the contents of the file.
            while (inputFile.hasNext())
            {
                // Get a month's sales amount.
                // The nextDouble method may throw a InputMismatchException
                oneMonth = inputFile.nextDouble();

                // Accumulate the amount.
                totalSales += oneMonth;

                // Increment the month counter
                months++;
            }

            // Close the file.
            inputFile.close();

            // Calculate the average.
            averageSales = totalSales / months;

            // Display the results.
            JOptionPane.showMessageDialog(null,
                    "Number of months: " + months
                    + "\nTotal Sales: $"
                    + dollar.format(totalSales)
                    + "\nAverage Sales: $"
                    + dollar.format(averageSales));

        } 
        catch (FileNotFoundException e)
        {
            // Thrown by the Scanner constructor when the file is not found.
            JOptionPane.showMessageDialog(null,
                    "The file " + filename + " does not exist.");

        } 
        catch (InputMismatchException e)
        {
            // Thrown by the Scanner class's nextDouble method when a non-numeric value is found.
            JOptionPane.showMessageDialog(null, "Non-numeric data found in the file.");
        } 
        System.exit(0);
    }
}